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JavaRanch » Java Forums » Certification » Web Component Certification (SCWCD/OCPJWCD)
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AttributeListeners VS BindingListeners

Ricardo Cortes
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Joined: Jan 23, 2002
Posts: 140
I am having some problems understanding the difference in functionality provided by the HttpSessionAttributeListener interface and the HttpSessionBindingListener interface. Does anyone have an easy way of differentiating the roles of the above named interfaces?
[ May 06, 2002: Message edited by: Ricardo Cortes ]

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Ricardo Cortes
Ranch Hand

Joined: Jan 23, 2002
Posts: 140
Actually, I think I finally figured it out. Correct me if I am wrong. If I have an object aBook of type Book, then HttpSessionAttributeListener will send out a notification when an object has been added, replaced or removed from the session whereas HttpSessionBindingListener will send out a notification (as long as Book implements the HttpSessionBindingListener interface) when aBook has been bound or unbound from the session. Is this a correct?
Ricardo Cortes
Ranch Hand

Joined: Jan 23, 2002
Posts: 140
I guess I never realized how good the search function of this messageboard really was...I did some searching and found several posts on the subject, including this one:
http://www.coderanch.com/t/164328/java-Web-Component-SCWCD/certification/difference-HttpSessionBindingListner-HttpSessionAttributeListner
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: AttributeListeners VS BindingListeners